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Related Experiment Videos

Timolol and epinephrine in primary open angle glaucoma. Transient additive effect

J V Thomas, D L Epstein

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |January 1, 1981
    PubMed
    Summary

    Timolol and epinephrine initially lower intraocular pressure (IOP) together in glaucoma patients. However, this additive effect is lost over time, with epinephrine followed by timolol showing better IOP control.

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    Area of Science:

    • Ophthalmology
    • Pharmacology

    Background:

    • Primary open-angle glaucoma is a leading cause of irreversible blindness.
    • Effective management of intraocular pressure (IOP) is crucial for preventing glaucomatous optic nerve damage.

    Purpose of the Study:

    • To investigate the additive effects of timolol and epinephrine on intraocular pressure (IOP) in patients with primary open-angle glaucoma.
    • To explore the influence of treatment sequence on the efficacy of combined timolol and epinephrine therapy.

    Main Methods:

    • A randomized, double-blind clinical study involving 16 patients with primary open-angle glaucoma.
    • Patients were assigned to two treatment sequences: timolol followed by epinephrine, or epinephrine followed by timolol, each for two weeks.
    • Intraocular pressure (IOP) and facility of outflow were measured throughout the study.

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    Main Results:

    • An initial additive effect of timolol and epinephrine on lowering IOP was observed in both treatment sequences.
    • Complete loss of the additive effect was noted after several weeks of combined therapy.
    • Patients receiving epinephrine first, followed by timolol, exhibited significantly lower IOPs for at least two weeks compared to the reverse sequence.
    • Epinephrine monotherapy significantly increased facility of outflow, an effect diminished with concurrent timolol treatment.

    Conclusions:

    • The sequence of administering timolol and epinephrine influences their combined efficacy in lowering IOP.
    • Epinephrine's positive impact on outflow facility may be attenuated by simultaneous timolol administration.
    • Findings suggest distinct beta- and alpha-adrenergic mechanisms influencing aqueous dynamics in glaucoma management.